“We’ve taken metaphors for evolution to heart, reading them to mean that life is a race to kill or be killed.┬áBut we know now that that picture is incomplete.” In Nautilus, Kelly Clancy says it’s time to give the violent metaphors of evolution a break. Sometimes evolution is about the survival of the fittest. Other times, it’s about working together and being friendly. It’s what one biologist calls the snuggle for survival.